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16#include <linux/platform_device.h>
17#include <linux/init.h>
18#include <linux/input.h>
19#include <linux/interrupt.h>
20#include <linux/module.h>
21#include <linux/slab.h>
22
23#include <mach/hardware.h>
24#include <mach/jornada720.h>
25
26MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>");
27MODULE_DESCRIPTION("HP Jornada 710/720/728 touchscreen driver");
28MODULE_LICENSE("GPL v2");
29
30struct jornada_ts {
31 struct input_dev *dev;
32 int x_data[4];
33 int y_data[4];
34};
35
36static void jornada720_ts_collect_data(struct jornada_ts *jornada_ts)
37{
38
39
40 jornada_ts->x_data[0] = jornada_ssp_byte(TXDUMMY);
41 jornada_ts->x_data[1] = jornada_ssp_byte(TXDUMMY);
42 jornada_ts->x_data[2] = jornada_ssp_byte(TXDUMMY);
43
44
45 jornada_ts->y_data[0] = jornada_ssp_byte(TXDUMMY);
46 jornada_ts->y_data[1] = jornada_ssp_byte(TXDUMMY);
47 jornada_ts->y_data[2] = jornada_ssp_byte(TXDUMMY);
48
49
50 jornada_ts->x_data[3] = jornada_ssp_byte(TXDUMMY);
51
52
53 jornada_ts->y_data[3] = jornada_ssp_byte(TXDUMMY);
54}
55
56static int jornada720_ts_average(int coords[4])
57{
58 int coord, high_bits = coords[3];
59
60 coord = coords[0] | ((high_bits & 0x03) << 8);
61 coord += coords[1] | ((high_bits & 0x0c) << 6);
62 coord += coords[2] | ((high_bits & 0x30) << 4);
63
64 return coord / 3;
65}
66
67static irqreturn_t jornada720_ts_interrupt(int irq, void *dev_id)
68{
69 struct platform_device *pdev = dev_id;
70 struct jornada_ts *jornada_ts = platform_get_drvdata(pdev);
71 struct input_dev *input = jornada_ts->dev;
72 int x, y;
73
74
75 if (GPLR & GPIO_GPIO(9)) {
76 input_report_key(input, BTN_TOUCH, 0);
77 input_sync(input);
78 } else {
79 jornada_ssp_start();
80
81
82 if (jornada_ssp_inout(GETTOUCHSAMPLES) == TXDUMMY) {
83 jornada720_ts_collect_data(jornada_ts);
84
85 x = jornada720_ts_average(jornada_ts->x_data);
86 y = jornada720_ts_average(jornada_ts->y_data);
87
88 input_report_key(input, BTN_TOUCH, 1);
89 input_report_abs(input, ABS_X, x);
90 input_report_abs(input, ABS_Y, y);
91 input_sync(input);
92 }
93
94 jornada_ssp_end();
95 }
96
97 return IRQ_HANDLED;
98}
99
100static int __devinit jornada720_ts_probe(struct platform_device *pdev)
101{
102 struct jornada_ts *jornada_ts;
103 struct input_dev *input_dev;
104 int error;
105
106 jornada_ts = kzalloc(sizeof(struct jornada_ts), GFP_KERNEL);
107 input_dev = input_allocate_device();
108
109 if (!jornada_ts || !input_dev) {
110 error = -ENOMEM;
111 goto fail1;
112 }
113
114 platform_set_drvdata(pdev, jornada_ts);
115
116 jornada_ts->dev = input_dev;
117
118 input_dev->name = "HP Jornada 7xx Touchscreen";
119 input_dev->phys = "jornadats/input0";
120 input_dev->id.bustype = BUS_HOST;
121 input_dev->dev.parent = &pdev->dev;
122
123 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
124 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
125 input_set_abs_params(input_dev, ABS_X, 270, 3900, 0, 0);
126 input_set_abs_params(input_dev, ABS_Y, 180, 3700, 0, 0);
127
128 error = request_irq(IRQ_GPIO9,
129 jornada720_ts_interrupt,
130 IRQF_DISABLED | IRQF_TRIGGER_RISING,
131 "HP7XX Touchscreen driver", pdev);
132 if (error) {
133 printk(KERN_INFO "HP7XX TS : Unable to acquire irq!\n");
134 goto fail1;
135 }
136
137 error = input_register_device(jornada_ts->dev);
138 if (error)
139 goto fail2;
140
141 return 0;
142
143 fail2:
144 free_irq(IRQ_GPIO9, pdev);
145 fail1:
146 platform_set_drvdata(pdev, NULL);
147 input_free_device(input_dev);
148 kfree(jornada_ts);
149 return error;
150}
151
152static int __devexit jornada720_ts_remove(struct platform_device *pdev)
153{
154 struct jornada_ts *jornada_ts = platform_get_drvdata(pdev);
155
156 free_irq(IRQ_GPIO9, pdev);
157 platform_set_drvdata(pdev, NULL);
158 input_unregister_device(jornada_ts->dev);
159 kfree(jornada_ts);
160
161 return 0;
162}
163
164
165MODULE_ALIAS("platform:jornada_ts");
166
167static struct platform_driver jornada720_ts_driver = {
168 .probe = jornada720_ts_probe,
169 .remove = __devexit_p(jornada720_ts_remove),
170 .driver = {
171 .name = "jornada_ts",
172 .owner = THIS_MODULE,
173 },
174};
175
176static int __init jornada720_ts_init(void)
177{
178 return platform_driver_register(&jornada720_ts_driver);
179}
180
181static void __exit jornada720_ts_exit(void)
182{
183 platform_driver_unregister(&jornada720_ts_driver);
184}
185
186module_init(jornada720_ts_init);
187module_exit(jornada720_ts_exit);
188
